Miscellany

irb(main):002:0> moo = [[1,2,3,4,5,6,7]]=> [[1, 2, 3, 4, 5, 6, 7]]irb(main):003:0> moo.clone.each { |x| puts x.shift }1=> [[2, 3, 4, 5, 6, 7]]irb(main):004:0> moo=> [[2, 3, 4, 5, 6, 7]]irb(main):005:0> moo.dup.each { |x| puts x.shift }2=> [[3, 4, 5, 6, 7]]irb(main):006:0> moo=> [[3, 4, 5, 6, 7]]irb(main):007:0>